CN107079073B - Translatable calibration of scanner target - Google Patents

Abstract

In one example, document scanner has fixed position scan bar and built-in translatable calibration target.Scan bar has the linear array for aiming at the image-forming component on imaging direction.It is spaced apart and parallel with linear array to calibrate target, and there is the plane surface orthogonal with the imaging direction of the length across linear array.Target is translatable on the direction in the plane on surface during calibration.

Description

Translatable calibration of scanner target

Background technique

Optical imagery scanner is widely used for generating the digital representation of real world objects, and the object is particularly such as The medium of document etc, the document may include text, figure, print image etc..The case where using falt bed scanner Under, medium is maintained in the fixation position on platen by removable scan bar during scanning.Alternatively, text is being used In the case where shelves scanner (also known as transfer type scanner), medium is made to be fed through the scanning of fixed position during scanning Stick.In order to generate the digital representation with high image quality, it may be desirable for the calibration of scanner.For some scannings Stick technology, it may be desirable for operation calibration again, to ensure high image quality at any time.

Detailed description of the invention

Fig. 1 is that according to the exemplary of the disclosure there is fixed position scan bar and the document of built-in translatable calibration target to sweep Retouch schematically showing for instrument.

Fig. 2 is that according to the exemplary of the disclosure there is fixed position scan bar and the document of built-in displaceable calibration target to sweep Schematically showing for instrument is retouched, wherein making document feed by document scanner to be used to scan.

Fig. 3 is according to the exemplary biasing plate component with displaceable calibration target of the disclosure and for file scanning The decomposition equal proportion of the drive system of the component of instrument indicates.

Fig. 4 is indicated according to the assembled equal proportion of the biasing plate component of exemplary Fig. 3 of the disclosure.

Fig. 5 A is indicated according to the pedestal of the biasing plate component of exemplary Fig. 3-Fig. 4 of the disclosure and the equal proportion of carrier.

Fig. 5 B is according to the exemplary for putting down on the direction of the ary Quadrature of the image-forming component with scan bar of the disclosure Move the two-dimensional top plan view of the pedestal of the biasing plate component of Fig. 3-Fig. 4 of calibration target.

Fig. 5 C is according to the exemplary for putting down on the direction of the ary Quadrature of the image-forming component with scan bar of the disclosure Move the two-dimensional top plan view of the pedestal of the biasing plate component of Fig. 3-Fig. 4 of calibration target.

Fig. 6 A is according to the schematic side elevation of the exemplary scanner of the disclosure, and the scanner is shown in last The biasing plate component of Fig. 3 in the file scanning position in face.

Fig. 6 B is according to the schematic side elevation of the exemplary scanner of the disclosure, and scanner shows tight during calibration With the biasing plate component of Fig. 3 in the most advanced position of translation.

Fig. 7 be according to the exemplary document scanner of the disclosure multiple offsets staggeredly biasing plate component array and The equal proportion of common driver system for component indicates that the staggeredly biasing plate component of each offset has translatable calibration mesh Mark.

Fig. 8 is that have the array being located in operating position with the scan bar in maintenance position according to the exemplary of the disclosure Document scanner schematic side indicate.

Fig. 9 is the exemplary method for calibrating document scanner in the case where no document using calibration according to the disclosure Flow chart.

Figure 10 is the process for the method being scanned according to the exemplary document scanner using Fig. 9 of the disclosure to document Figure.

Specific embodiment

Scan bar can utilize different technologies for its image-forming component.CCD(charge can be used in a type of scan bar Coupled apparatus) element.CIS(contact-type image sensor can be used in another type of scan bar) element.Each type All with the characteristic of its own.For example, the cost of CIS scan bar is relatively low, size is small, high resolution and power use it is low. However, CIS lens array has the shallow depth of field (depth of field).The object being located in the 0.2mm of the glass of cis module Body obtains optimum picture quality when through scanning.Scanning quality degrades with the increase of the distance away from cis module lens array. When CIS scan bar is periodically recalibrated, they also provide optimum picture quality.

As limited herein and in appended claims, " document scanner " can be broadly interpreted as optical imagery and set It is standby, wherein making the document to be scanned flowing during image scanning operation or being fed through the scanning of the fixation position of scanner Stick.As limited herein and in appended claims, " fixed position scan bar " is in the scanning executed by document scanner The scan bar not moved during operation.

A kind of scheme of scan bar in calibration document scanner involves user's feeding and scans special calibration document.So And due to user's interaction, such calibration cannot automatically carry out.If user puts off or omits this manual calibration, The picture quality of scanning output may degrade.Moreover, special calibration document may be easily damaged, and may replace get up it is high It is expensive and inconvenient.Thus, this calibration program usually gives not good enough user experience.

Another scheme of scan bar in calibration document scanner uses the column rotational alignment being built in scanner Target.Although this avoids the needs for special calibration document, cylinder, which may have, to be exhausted or other characteristics, so that rotation Shaft is not aligned with lens array or cylinder do not have it is flat against scan bar.In the case where CIS scan bar, due to shallow The reason of the depth of field may cause using the scanning of the calibration target with such non-aligned cylinder across the image scanned Significant brightness changes, this makes image quality degradation.When scanning transparent or semitransparent document, also filled in column rotational alignment target In the case where background, it is also possible to similar brightness occur and change.

The again another scheme of fixation position scan bar in calibration document scanner is flat in scanner using being built in Smooth, static calibration target.Flat target helps avoid the change of the brightness across scan bar.However, if target becomes impaired (example Such as, scratch, be dirty or be covered with dust or pollutant), then the impaired portion as some pairs of target surfaces in image-forming component Divide being imaged as a result, calibration may be unsuccessful or inaccurate, so as to cause from the low of the scanning for using calibration result Picture quality.In addition, the target in replacement scanner may be difficult and expensive, and such maintenance operation is usual It cannot be completed by user.

Referring now to attached drawing, the example of the document scanner with built-in calibration target, the built-in calibration mesh are illustrated Mark can automatically carry out calibration in the case where not using special calibration document, and the built-in calibration target even can With the calibration that runs succeeded in the case where there is some flaws in calibrating target or in calibration target.Document scanner includes fixing Position scan bar, fixed position scan bar have the linear battle array for aiming at the image-forming component on the imaging direction with ary Quadrature Column.Be spaced apart with linear array and it is parallel be translatable calibration target, translatable calibration target with imaging direction just The plane surface of friendship, length of the imaging direction across linear imaging element array.During calibration, the target is on surface It is translatable on direction in plane.

An example document scanner is considered now, and with further reference to Fig. 1, scanner 100 has scan bar 110. Scan bar (scan bar) 110 is attached to the part 105 of scanner 100 in fixed position, and scan bar 110 in scanning or It is not moved during imaging operation.Scan bar 110 have image-forming component 112(illustrate wherein several) substantial linear battle array Column.Image-forming component 112 all has visual field, and aims in the imaging direction 114 orthogonal with linear array.Scan bar 110 can To include lens array (not shown), the lens array makes visual field have the pre-qualified depth of field.In some instances, lens array Column are rod-like lens arrays.

Scanner 100 also has built-in translatable calibration target 140.Target 140 is spaced apart and puts down with scan bar 110 Row.More particularly, target 140 has the plane orthogonal with imaging direction 114, flat surfaces 142.Plane surface 142, which limits, to be sat The X-Y plane of mark system 102.Throughout the translation of target 140, target 140 has in the X direction to be seen at least across by scan bar 110 The size for the distance in X-direction seen, and have in the Y direction at least across in the Y-direction watched by scan bar 110 away from From size.In the Z-direction of coordinate system 102, plane surface 142 is with distance S 120 from the plane surface 116 of scan bar 110 It is spaced apart.In some instances, interval S 120 can be less than predefined distance.In some instances, image-forming component 112 can To be CIS element, and interval S 120 can be 0.2 millimeter or smaller.For the given position of target 140, each imaging Element 112 can watch the correspondence imaging area 144 of plane surface 142.

Target 140 is translatable in scanner 110, and thus translatable relative to fixed position scan bar 110.Target It is translated on 140 assigned direction in X-Y plane to maintain interval S 120 during translation.Thus, in the Y direction, target 140 is wider than the size of imaging area 144.In one example, target 140 can translate at least 0.2 millimeter of distance.At another In example, target 140 can translate with the size of the size of imaging area 144 and defect it is proportional at a distance from, allow to exclude Scanning corresponding to defect exports.In some instances, target 140 translates during calibration operation, and grasps in file scanning It is maintained during work in fixed position.The fixation position used during file scanning can be pre-qualified.

In some instances, translation direction of the target 140 in X-Y plane can be linear with image-forming component 112 On the direction 146 of ary Quadrature.In this case, imaging area 144 is moved along the linear sub-area of plane surface 142 147.Other In example, translation direction of the target 140 in X-Y plane be with the non-orthogonal direction 148 of the linear array of image-forming component 112 On.In this case, imaging area 144 is fallen along the linear sub-area of plane surface 142 149.It is non-if being then discussed in greater detail Orthogonal direction 148 can provide increased calibration robustness in the case where dirty or impaired target surface 142.Target 140 Have sufficient width to ensure that all subregions 147,149 are fallen in target 140 in the Y direction.

In some instances, the plane surface 142(of target 140 its do not have it is dirty or impaired) in color substantially It is even.In some instances, which is substantially white in color.

Consider to execute the example document scanner that file scanning operates now, and referring to Fig. 2, document scanner 200 is wrapped Include scan bar 110 and target 140.Feed document 220 between scan bar 110 and target 140 Pass through scanner 200.Target 140 is attached to or is integrated into some cases biasing plate component 250.Biasing plate component 250 maintain the surface 222 of document 220 at the spacing on the surface 116 away from scan bar 110, this allows high quality to be imaged.One In a little examples, biasing plate component 250 promotes document 220 by contact document 220 and against the surface of scan bar 110 116 Opposed surface 222 and complete this point.In order to adapt to the various thickness of document 220, at least top (its of biasing plate component 250 May include target 140) it is moved in the Z-direction of coordinate system 102, to allow the surface 222 and surface 116 of various documents It is properly spaced out.The top of biasing plate component 250 including target 140 can also comply with into the surface of compliance scan bar 110 116 and/or document 220 in irregularity, especially wherein biasing plate component 250 directly or indirectly via document It is especially true in the case where 220 contact surfaces 116.

In some instances, translation direction of the target 140 in X-Y plane is identical as document feed direction 205.Other In example, the translation direction of target 140 is the direction different from document feed direction 205 in X-Y plane.

In some instances, calibration target 140 provides the back for transparent or semitransparent document 220 also during scanning Scape.When scanning such document, if scanner 100,200 does not provide the uniform face of the part for just scanned document The background of color (in some instances, white), then the scanning defect including shadow there may be.When scanning is general transparent or semi-transparent When bright document 220, the uniform color of target 140 minimizes or prevents such to scan defect.

An example with the biasing plate component of translatable calibration target is considered now, and referring to Fig. 3 and 4, biasing Board group part 300 includes pedestal 310, carrier 320, (it can take many shapes as described below at least one elastic component Formula) and with the biasing plate 340 for calibrating target 350.Biasing plate component 300 is coupled to drive system 370, drive system 370 It is coupled to carrier 320, to slide carrier 320 controllably relative to pedestal 310.Drive system includes driver 375, cam Axis 380, at least one cam 385 and bearing 390.Fig. 3 depicts the decomposition view of biasing plate component.Fig. 4 depicts biasing The view of the assembling of board group part.In some instances, biasing plate component 300 is constructed by inexpensive molded plastic part mostly.

Biasing plate 340, which has, to be attached to it or is integrally formed calibration target 350 in or on which.Calibrate target 350 be flat and in color uniformly, and can be calibration target 140(Fig. 1-Fig. 2).Low timber 342 is in coordinate system Extend on target 350 in 302 Z-direction.When biasing plate 340 contacted with document 220(Fig. 2 for just scanning) or with scanning Stick 110(Fig. 1-Fig. 2) surface 116 when contacting, timber 342 creates the small―gap suture between surface 116 and target 350.The gap Maintain the pre-qualified spacing between surface 116 and target 350, and also protection target 350 to prevent due to document 220 or With abrasion caused by the contact on the surface 116 of scan bar 110.What biasing plate 340 was flexible and complied with, to be obedient to surface 116.In one example, biasing plate 340 is by inexpensive flat-white ABS(acrylonitrile-butadiene-styrene (ABS)) plastic material mould System.In other examples, biasing plate 340 can be metal or other materials.Biasing plate 340 also there is ramp type to introduce surface 344 to help smoothly to feed document 220 between scan bar 110 and biasing plate 340 and prevent card plug.Biasing plate 340 Biasing plate 340 is fixedly attached to carrier 320 by least one hasp 346.Hasp 346 allows biasing plate 340(to include target 350) From carrier 320 pitch with allow by user rather than the maintenance personal of special training is convenient for changing.

Elastic component entirety provides the abundant preloading of biasing plate 340 to promote partially towards the surface of scan bar 110 116 Set plate 340.In one example, each elastic component is coil spring 330.In other examples, elastic component is piece bullet Spring, compressible material or another suitable components.If being not inserted into the document for scanning, coil spring 330 is against sweeping The surface 116 for retouching stick 110 promotes biasing plate 340.If document of the insertion for scanning, coil spring 330 is against document 220 Biasing plate 340 is promoted, the surface 222 of the document 220 is then promoted against the surface of scan bar 110 116.Coil spring 330 closes It is tuned in the power that they are applied to minimize or eliminate document card plug.

Carrier 320 retains biasing plate 340 and accommodates coil spring 330.Every one end of coil spring 330 can pass through column Bar 322 is incorporated on carrier, and corresponding mast (not shown) is incorporated on biasing plate 340.Each hasp 346 is connected to pair Answer acceptor 324.The power help applied from coil spring 330 to biasing plate 340 and carrier 320 maintains biasing plate 340 and carrier Connection between 320.Length along carrier 320 allows each compressing not same amount with various intervals setting coil spring 330, This surface 116 for helping biasing plate 340 to be obedient to scan bar 110 and/or irregularity in document 220 are to maintain to scan bar 110 appropriate spacing.

Carrier 320 include at least a pair of cams combination bag body (pocket) 326A, 326B(broadly, 326).Bag body 326 It can have inverted U-shape shape, be sized in conjunction with the cam of drive system 380, such as more referring next to Fig. 6 A-6B It is discussed in detail, so as to translational offset plate 340.Bag body 326A extends along Y-axis line from the front side of carrier 320, and bag body 326B is along Y Axis extends from the opposite back side of carrier 320.Bag body 326A, 326B promotes multiple biasing plate components and single drive system one It rises and uses, as discussed referring next to Fig. 7.

Carrier 320 further includes at least one pedestal binding characteristic on the downside of carrier 320.Pedestal binding characteristic is at one It can be timber 328 in example, timber 328 combines the guide features on pedestal 310 slideably to promote biasing plate 340 Translation.In other examples, pedestal binding characteristic is pin, slit or another suitable characteristics.

Pedestal 310 retains carrier 320.In one example, respectively self-bonding carries at least one hook 312 on pedestal 310 Respective slots 329 on body 320.Carrier 320 is also attached to the chassis (not shown) of scanner by pedestal 310.Pedestal 310 is solid Positioning is attached to chassis in setting.Pedestal 310 combines carrier 320 also translatablely.In some instances, pedestal 310 and carrier 320 Slideably combine.This combination is via at least one guide features on pedestal 310.In one example, guide features It is the guide slit 314 of the pairing timber 328 in conjunction with carrier 320.Guide slit 314 controls the translation direction of biasing plate 340, such as It is discussed referring next to Fig. 5 A-5C.

About drive system 370, driver 375 controllably rotates its camshaft 380 being coupled to by desired amount. For diagram for the sake of simplicity, driver 375 is portrayed as the single gear fixed to camshaft 380, and driving is not shown The other parts of device 375.

Camshaft 380 rotates under the control of driver 375.At least one cam 385 is arranged on camshaft 380 Angular position.As camshaft 380 rotates, the speed and distance of shape and position control the biasing plate translation of cam 385.Knot The cam 385 for closing single biasing plate component is generally arranged at the equal angular position on camshaft 380.

The support of each bearing 390 and convex wheel shaft 380.Each bearing 390 is affixed to the chassis of scanner.One In a example, bearing is formed by the cunning material with advantageous lubricity, allows camshaft 380 in the lifetime of scanner Between without transition it is dilatory in the case where rotate.

In other examples, it can use the replaceable mechanism for translational offset plate 340.As an example, rack gear With gear transmission system pinion gear can be engaged on the bottom of carrier 320 so as to the corresponding teeth on camshaft 380 Wheel combines.

Consider carrier 320 and pedestal 310 in further detail now, and referring to Fig. 5 A-5 C, the translation side of biasing plate 340 It is managed to by the direction of timber 328 and guide slit 314.In one example, Fig. 5 B pedestal 310A provide for Scan bar 110(Fig. 1-Fig. 2) image-forming component 112 the orthogonal direction 502A of linear array on translational offset plate 340(and Calibrate target 350).In this case, guide slit 314A and timber 328 extend on orthogonal direction 502A.

In another example, the pedestal 310B of Fig. 5 C is provided in the linear of the image-forming component 112 with scan bar 110 Translational offset plate 340(and calibration target 350 on the non-orthogonal direction of array).In this case, guide slit 314B and timber 328 extend on nonopiate direction 502B.It is such it is nonopiate translation can be advantageous in the following areas: it is defective at Element 112 and the scratch for being orientated and being long enough in the calibration target 350 of entire translation distance in a transverse direction Or dirty point distinguishes.This is because if translation direction is orthogonal with the linear array of image-forming component 112 of scan bar 110, Complete scratch or dirty point in the calibration target 350 being orientated on translation direction are by (multiple) identical image-forming component 112 throughout translation And it captures.However, if translation direction is not orthogonal with the linear array of image-forming component 112 of scan bar 110, in target When 350 translation, any scratch or dirty point calibrated in target 350 will be captured by different image-forming components 112.This shows: these Various image-forming components 112 itself all work, and calibrate target 350 and scratched or dirty.As begged for referring next to Fig. 9 By, when calibration is performed, can compensate scratch or dirty point.

In some instances, the length of each slit 329 on carrier 320 is wanted on the translation direction of biasing plate 340 Length than its correspondence hook 312 on pedestal 310 is long.This allow slit 329 during the translation of biasing plate 340 relative to Hook 312 translates.Hook 312 and its pairing slit 329 and guide slit 314 and timber 328 are in identical direction 502A, 502B It is upper angled.Hook 312A, 312B of Fig. 5 B-5C, which is illustrated, is respectively used to this angled of orthogonal and nonopiate situation.

The translation of the biasing plate 340 including calibration target 350, and the figure of certain parts referring to scanner are considered now The schematic side elevation of 6A-6B, scanner orientations are so that front is the left side and is below the right.Pedestal 310 is fixed to and sweeps Retouch instrument chassis 630.The part of calibration target 350 and biasing plate 340 projects into Document Creator platform by the aperture in platen 620 620 top of plate.In fig. 6, biasing plate 340 and calibration target 350 are located at rearmost file scanning position, and line The timber of biasing plate 342 is promoted and is contacted at the viewing surface 612 with scan bar 610 by coil spring 330.Camshaft 380 is suitable Hour hands rotate an amount, so that the outside right side wall of the bag body 326B of 385 contact carrier 320 of cam, and continue rotation to incite somebody to action Carrier 320 and its attached biasing plate 340 and calibration target 350 move in rearmost file scanning position, wherein it It is maintained during scanning.On direction 604 above platen 620 by document feed into scanner, and the introducing of biasing plate 340 Portion 344 guides document between timber 342 and viewing surface 612.Biasing plate 340 is pressed by document to allow it to flow through scanning Instrument, so that coil spring 330 be made to compress corresponding amount.By scan bar 610 to document imaging at sight 614.Timber 342 serves as Wear point for contacting with document and the gap 616 between calibration target 350 and scan bar viewing surface 612 is created, by This protection calibrates target 350 to prevent being damaged by document.

In fig. 6b, at least component 618 during calibration process in the Y-direction with coordinate system 602 is illustrated After side translates up a distance, the biasing plate 340 and calibration target 350 that are located at the most advanced position in scanner.In It, will not be in document interleave scan instrument in calibration process.For translational offset plate 340 and calibration target 350, camshaft 380 is inverse Hour hands rotate an amount, so that the inside left side wall of the bag body 326B of 385 contact carrier 320 of cam, and continue rotation to incite somebody to action Carrier 320 and its attached biasing plate 340 and calibration target 350 are from position translation backmost into most advanced position.Flat During shifting, the image-forming component of scan bar 610 to calibration target 350 subregion (for example, subregion 147 or subregion 149, Fig. 1) into Row imaging.In the most advanced position of Fig. 6 B, sight 614 watches the calibration target 350 different from the position backmost of Fig. 6 A Position.Calibration process is described more fully referring next to Fig. 9.

Consider to be used for multiple offsets now, interlock, multiple offsets of the corresponding array of fixed position scan bar, staggeredly biasing The exemplary arrays of board group part, and referring to Fig. 7, multiple scan bar arrays can be used for scanning the span having than single scan bar The document of big width.Scan bar can be offset from one another, in order to provide the overlapping region between every two scan bar, wherein two A scan bar can be imaged the corresponding part of document.By each scan bar captured image can stitch and fasten with Form the composograph for indicating entire document.

Exemplary arrays 700 include 710) three translatable biasing plate component 710A-710C(are referred to as.Each biasing board group Part 710 can be biasing plate component 300(Fig. 4), and each biasing plate component 710 includes calibration target.In Fig. 7, figure Show the part of each end biasing plate component 710A, 710C, and illustrates all intermediate bias board group part 710B simultaneously.Often One biasing plate component 710 includes calibration target 350.

Exemplary arrays 700 have single common driver system, and the single common driver system translates all biasing board groups Part 710 and calibration target.Cam 385 on single camshaft 380 can be in conjunction with the preceding bag body 326A of single biasing plate component 710 Or rear bag body 326B.For example, cam 385 combines the rear side bag body 326B of each end biasing plate component 710A, 710C, and it is convex Wheel 385 combines the front side bag body 326A of intermediate bias board group part 710A.

In the scanner with multiple biasing plate assembly arrays 700, biasing plate component 710 can be put down in the same direction It moves.In some instances, cam 385 is fixed at the equal angular position on camshaft 380, so as to synchronously or consistently Translate all biasing plate components 710.In other examples, it can be fixed on for the cam 385 of each biasing plate component 710 At Difference angles on camshaft 380, sequentially to translate each biasing plate component 710.The sequence of biasing plate component Translate reduce for calibration process bandwidth requirement in terms of can be it is useful because the calibration of different scanning stick can be not It executes with the time rather than simultaneously executes.

Schematically showing for example document scanner is considered now, and referring to Fig. 8, scanner 800 includes interlaced arrangement Multiple scan bars 810.Platen 820 is located on the surface of shell 805, illustrates the part of shell 805.All have calibration target The top of biasing plate component 830 projected into above platen 820 from shell 805.Each biasing plate component 830 can be biasing Board group part 300(Fig. 4).Scanner 800 further includes document delivery mechanism 840, the drive system 850 for biasing plate component 830 And controller 860.Controller 860 is communicatively coupled to document delivery mechanism 840, drive system 850 and scan bar 810.

Controller 860 includes the processor 862 for being coupled to such as computer-readable medium of memory 864 etc.Processing Device 862 executes the instruction 866 being stored in memory 864 makes document feed pass through scanning to control document delivery mechanism 840 Document and/or calibration target is imaged in instrument 800, control scan bar 810, controls 850 translational offset board group part of drive system 830 biasing plate and calibration target.

Scan bar 810 can be attached to the structural elements of scanner 800.In some instances, structural elements, which is attached to, sweeps Retouch the removable lid of instrument 800.Describe structural elements in two positions: operating position 870(solid line) and maintenance position 870' (dotted line).

During operation, scan bar 810 is located in it adjacent to the normal operating of biasing plate component 830 by the structural elements In position 870.In order to repair biasing plate component 830 or other purposes, when making structural elements be moved to maintenance position 870', Remove scan bar 810 from its operating position.In maintenance position 870', the user of scanner can close to biasing plate component 830, And it can easily clean, remove and/or replace biasing plate (for example, biasing plate 340, Fig. 3-Fig. 4).

A kind of exemplary method is considered referring now to Fig. 9, and the method is used for no using the school for being fed through scanner Document scanner is calibrated in the case where quasi- document.The flow chart of Fig. 9 can be considered as realization in scanner or in its controller Step in method.Alternatively, the flow chart of Fig. 9 can be considered as scanner or at least part of flow chart of its controller. Scanner can be scanner 100(Fig. 1), 200(Fig. 2) or 800(Fig. 3).Method 900 is swept at 902 by that will be built in It retouches the plane in instrument, flat translatable calibration target and controllably moves pre-determining relative to the fixation position scan bar of scanner Distance and start.Target can be mobile from initial position used during file scanning.In some instances, in calibration mesh Translation calibration target in the plane on target surface.In some instances, it at 904, is being presented with document by the document of scanner Mobile calibration target on the direction for sending direction different.

At 906, during movement using scan bar to calibration target be repeatedly imaged so that each of scan bar at Element captures picture signal for the subregion (for example, subregion 147 and/or 149) of the flat surfaces of calibration target.Show some In example, at 910, calibration target is promoted against the imaging surface of scan bar during movement.

At 912, processing is from each image-forming component institute captured image signal with calibration scan instrument.In some examples In, at 914, calibrate target 140(Fig. 1-Fig. 2) or its plane surface 142 be flat-white in the case where, processing includes For white point and uniformity come calibration scan stick.Each image-forming component of scan bar can have different from other image-forming components Response characteristic (photo response heterogeneity or PRNU).Calibration for white point is related to based on to white calibration targeted scans Obtained from image-forming component output to be directed to the white point calibration constant that the image-forming component generates each color.For uniformity Calibration is related to generating these calibration constants for all image-forming components of scan bar to make the response from all image-forming components It is uniform across scan bar.Sweeping for just scanned object (in this case, calibrating target) can also be counted and irradiate by doing so Retouch the heterogeneity in the light source of instrument.Then utilize these calibration constants to generate from scan bar during subsequent scanning The unified response with correct color balance of all image-forming components.When determining white point and uniformity, processing corresponds in school By the image sequence of the subregion (for example, subregion 147 and/or 149) of image-forming component imaging during the translation of quasi- target.Such place Reason 912 reduces or eliminates the influence of the dirty point of calibration target, scratch or other damages to white point and uniformity.For example, processing Image sequence can be averaging, or the exceptional value (outlier) in the image sequence for likely corresponding to damage can be abandoned Or give its less weight.As a result, for the calibration based on the measurement made using static calibration target, processing 912 generate more accurate calibration.

0 considers the exemplary method for being used to scan document referring now to fig. 1.The flow chart of Figure 10 can be considered as realization and exist The step in method in scanner or in its controller.Alternatively, the flow chart of Figure 10 can be considered as scanner or its control At least part of flow chart of device processed.Scanner can be scanner 100(Fig. 1) or 800(Fig. 8).Method 1000 is led at 900 It calibrates document scanner in the case where mistake no using the calibration document for being fed through scanner and starts.In some examples In, at 1002, calibration 900 will calibrate medium in no user intervention and not by scanner and be fed in scanner In the case of automatically initiate.In some instances, at 1004, user's replacement calibration target before calibration 900.Show some In example, at 1006, after calibration 900, calibration target is returned into initial position.Initial position can be the document of target Scan position.

At 1008, document feed is set to pass through scanner between scan bar and calibration target.At 1010, with document It is fed past scanner, is sequentially imaged using each band of the scan bar to document.During the imaging, calibration target dimension It holds in initial (scanning) position.At 1012, each band of imaging is handled to construct the digital representation of the document through scanning.

The term ("top", "bottom", " side " etc.) of orientation and relative position is not intended to require any element or assembly Specific orientation, and the convenience for illustrating and describing.

In some instances, at least one block or step being discussed herein are automations.In other words, device, system and Method automatically occurs.As limited herein and in appended claims, term " automation " or " automatically " (and it is similar Variation) it should be understood widely to mean to use in the case where unnecessary progress human intervention, observation, effort and/or decision The controlled operation of computer and/or the device of mechanical/electrical equipment, system and/or process.

It will be appreciated that from above, the document scanner and method provided by the disclosure indicates significantly improving for the prior art. In order to summarize this improved only several aspects, the big plane calibration minimized target parallel with scan bar is public to component and component Difference sensitivity, and minimize calibration and scanning during brightness change.The relatively long of target is calibrated during calibration process Translation distance maximizes the damage of compensation calibration target or the ability of the dirty point in calibration target.Moreover, the school during calibration Under the translation of quasi- target and the non-orthogonal situation of the linear array of scan bar, damage or dirty point to target can by with it is defective Image-forming component distinguish and can calibration when not consider.Calibration target and the translucent or transparent document that is scanned it Between spacing it is sufficiently small in the case where, calibration target provides shallow elimination background during scanning.Forefront timber protection calibration target To prevent the damage during file scanning, and calibrates target and can be easily cleaned or be replaced by the user of scanner.

Although having been described and illustrating several specific examples, the present disclosure is not limited to such description and illustrate specific Method, form or component layout.The description should be understood as including all novel and non-obvious of element described herein Combination, and claim can be rendered into any novel and non-aobvious and easy of these elements in this application or later application The combination seen.Aforementioned exemplary is illustrative, and without single feature or element for that can apply in this application or later In be necessary for claimed all possible combinations.Unless otherwise specified, the otherwise step of claim to a method Suddenly it does not need to execute with specified order.Similarly, in figure each piece or number ((1), (2) etc.) be not construed as walking Suddenly it must be executed with certain order.Additional piece/step can be added, some pieces/step, or change block/step can be removed Rapid order, and it is still in the range of disclosed example.In addition, the method or step discussed in different figures can It is exchanged with the method or step being added in other figures or with it.Again additionally, specific value data (such as, particular number, Number, classification etc.) or other specifying informations should be construed as be it is illustrative, for discussing example.Such specifying information Limitation example is not provided into.The present disclosure is not limited to implementations described above, but alternatively by appended claims according to its etc. It is limited with the full breadth of scheme.In the case where claim records "one" or " first " element or its equivalent, this The claim of sample should be understood as include one or more as element merging, both neither requiring nor excluding two or More such elements.In the case where claim records " having ", which is understood to mean " comprising ".

Claims (14)

1. a kind of document scanner, comprising:

The scan bar of fixed position, has the linear array for aiming at the image-forming component on imaging direction；And

With linear array be spaced apart and it is parallel built in translatable calibration target, the target with it is orthogonal with imaging direction simultaneously And the plane surface of the length across linear array, and the target is multiple in the plane of plane surface during calibration It is translatable on direction；

It include wherein non-just with the linear array of image-forming component in the multiple directions that the plane alignment target of plane surface translates The direction of friendship.

2. scanner described in claim 1, comprising:

Biasing plate is complied with calibration target；And

The elastic component for complying with biasing plate is promoted towards linear array.

3. scanner as claimed in claim 2, comprising:

It is removably attached to comply with the carrier of biasing plate；

It is attached to carrier translatablely and is fixedly attached to the pedestal of the chassis of scanner；And

Its elastic member is deposited between biasing plate and carrier, and biasing plate can be mobile to compress upwardly toward carrier in imaging side Elastic component.

4. scanner as claimed in claim 3, comprising:

It is coupled to carrier so as to the drive system controllably relative to pedestal translation carrier.

5. scanner as claimed in claim 2, elastic member promotes biasing plate against the shell of linear array, and wherein The contact surface of biasing plate compliance shell.

6. scanner described in claim 5, wherein the timber for complying with biasing plate is promoted against shell, timber maintains calibration target Pre-qualified spacing between shell.

7. scanner described in claim 1, the plane surface of alignment target has uniform color and is for scanning The background of transparent and translucent document.

8. a kind of method for calibrating document scanner in the case where no calibration document, comprising:

During calibration relative to the fixation position scan bar of scanner in the plane on the surface of flat translatable calibration target Multiple directions on the flat translatable calibration target being built in scanner controllably moved the distance of pre-determining；

During movement, calibration target is repeatedly imaged using fixed position scan bar, so that fixed position scan bar is every Signal of one image-forming component capture for the subregion on the flat even color surface of calibration target；And

The signal captured from each image-forming component is handled with calibration scan instrument；

Wherein include and the non-orthogonal direction of image-forming component in the multiple directions of the plane alignment target translation on surface.

9. method according to any one of claims 8, wherein processing includes calibrating in the white point for fixing position scan bar and uniformity extremely It is one few.

10. method according to any one of claims 8, wherein moving is the mobile calibration mesh on the direction different from document feed direction Mark.

11. method according to any one of claims 8 further includes after the treatment:

Calibration target is returned into initial position；

Document feed is set to pass through scanner between fixed position scan bar and calibration target；

During feeding, each band of document is sequentially imaged using fixed position scan bar, alignment target is in initial In position；And

Each band of imaging is handled to construct the digital representation of document.

12. method according to any one of claims 8, further includes:

During movement, calibration target is promoted against the surface of fixed position scan bar.

13. a kind of document scanner, comprising:

It is overlapped the scan bar array of staggered fixed position scan bar, the scan bar all has the linear array of image-forming component；

It is opened with scan bar array spacings and parallel be overlapped the staggeredly translatable array for calibrating target, each target has flat Face surface, the plane surface across corresponding imaging element array length and can by corresponding linear array image-forming component at Picture；And

Single drive system, be coupled to all calibration targets so as to during calibration operation relative to scan bar in plane surface Controllably translation calibration target in multiple directions in plane;

It include wherein non-just with the linear array of image-forming component in the multiple directions that the plane alignment target of plane surface translates The direction of friendship.

14. scanner described in claim 13, wherein single drive system includes:

Rotatable camshaft；

Multiple cams, the multiple cam are fixed to camshaft with angle position；And

Multiple cam combination members, the multiple cam combination member be coupled to calibration target in correspondence one and with it is convex Correspondence one combination in wheel.